On Fri, Nov 01, 2013 at 12:45:29PM -0700, Joe Perches wrote: > On Fri, 2013-11-01 at 13:37 -0400, Neil Horman wrote: > > > I think it would be better if we just did the prefetch here > > and re-addressed this area when AVX (or addcx/addox) instructions were > > available > > for testing on hardware. > > Could there be a difference if only a single software > prefetch was done at the beginning of transfer before > the while loop and hardware prefetches did the rest? >
I wouldn't think so. If hardware was going to do any prefetching based on memory access patterns it will do so regardless of the leading prefetch, and that first prefetch isn't helpful because we still wind up stalling on the adds while its completing Neil > > > -- > To unsubscribe from this list: send the line "unsubscribe netdev" in > the body of a message to majord...@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html > -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
